.\"	$OpenBSD: ul.1,v 1.15 2010/10/29 08:02:05 jmc Exp $
.\"	$NetBSD: ul.1,v 1.3 1994/12/07 00:28:23 jtc Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"     @(#)ul.1	8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: October 29 2010 $
.Dt UL 1
.Os
.Sh NAME
.Nm ul
.Nd do underlining
.Sh SYNOPSIS
.Nm ul
.Op Fl i
.Op Fl t Ar terminal
.Op Ar
.Sh DESCRIPTION
.Nm
reads the named files (or standard input if none are given)
and translates occurrences of underscores to the sequence
which indicates underlining for the terminal in use, as specified
by the environment variable
.Ev TERM .
The file
.Pa /etc/termcap
is read to determine the appropriate sequences for underlining.
If the terminal is incapable of underlining, but is capable of
a standout mode, then that is used instead.
If the terminal can overstrike,
or handles underlining automatically,
.Nm
degenerates to
.Xr cat 1 .
If the terminal cannot underline, underlining is ignored.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl i
Underlining is indicated by a separate line containing appropriate
dashes
.Pq Ql - .
.It Fl t Ar terminal
Overrides the terminal type specified in the environment with
.Ar terminal .
.El
.Sh ENVIRONMENT
.Bl -tag -width TERM
.It Ev TERM
Used to relate a tty device
with its device capability description (see
.Xr termcap 5 ) .
.Ev TERM
is set at login time, either by the default terminal type
specified in
.Pa /etc/ttys
or as set during the login process by the user in their
.Pa login
file (see
.Xr environ 7 ) .
.El
.Sh SEE ALSO
.Xr man 1
.Sh HISTORY
The
.Nm
command appeared in
.Bx 3.0 .
